Quasi-induced exposure: Methodology and insight

Nikiforos Stamatiadis, John A. Deacon

Research output: Contribution to journalArticlepeer-review

124 Scopus citations


Even though the numerator in accident rates can be accurately determined nowadays, the denominator of these rates is an item of discussion and debate within the highway safety community. A critical examination of an induced exposure technique, based on the non-responsible driver/vehicle of a two-vehicle accident (quasi-induced exposure), is presented here. Differences in exposure for a series of accident location and time combinations are investigated, the assumption of similarities between drivers of single-vehicle accidents and the responsible driver of multiple-vehicle accidents is refuted, and the use of the non-responsible driver as a measure of exposure is tested using vehicle classification data. The results of the analyses reveal the following: (1) accident exposure is different for different location and time combinations; (2) induced exposure estimates provide an accurate reflection of exposure to multiple-vehicle accidents; (3) induced exposure estimates are acceptable surrogates for vehicle miles of travel when estimates are made for conditions during which the mix of road users is fairly constant; and (4) the propensity for involvement in single-vehicle accidents is generally different than that in multiple-vehicle accidents for a given class of road users. We concluded that the quasi-induced exposure is a powerful technique for measuring relative exposure of drivers or vehicles when real exposure data are missing.

Original languageEnglish
Pages (from-to)37-52
Number of pages16
JournalAccident Analysis and Prevention
Issue number1
StatePublished - Jan 1997


  • Accident propensity
  • Accident time and location
  • Quasi-induced exposure
  • Relative accident ratios
  • Single-vehicle accidents

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Safety, Risk, Reliability and Quality
  • Law
  • Human Factors and Ergonomics


Dive into the research topics of 'Quasi-induced exposure: Methodology and insight'. Together they form a unique fingerprint.

Cite this